@Steve Q thanks for responding. I’ve had this all apart today in the breaks in the weather, and there are no signs of corrosion anywhere, but the wiring harness fabric is still soaked. I’ve cleaned the crap up, but I’m not sure this is the problem now.
After checking all fuses in the SA fuse holder (in the plenum chamber), fuse SA9 is showing 0 volts. According to Elsawin, SA9 is for Voltage Stabiliser -J532-, and ALSO Engine Control Unit -J623-!!!
I m having trouble understanding where this feed comes from in the first place though so that I can work backwards.
@Anton8 thanks for replying. I got a battery tester today, but haven’t had chance to use it yet. The battery keeps going low with all the ignition on testing. Yesterday I had it on charged up to 12.7v when I put the multimeter across the Jump start point in the engine bay. It’s not dropped to 11.5v as possibly the DRL’s are annihilating it with the ignition on during my checks.
hopefully the weather holds off and I can charge and test tomorrow to rule it out.